Signature-suppressed anti-materiel rifle
From Halopedia, the Halo wiki
This signature-suppressed anti-materiel rifle[Note 1] is a sniper rifle in service with the UNSC Armed Forces. Snipers aboard the UNSC Spirit of Fire used the rifle during the conflict on Installation 00 in 2559.
The rifle features a receiver and stock similar in design to the SRS99-AM sniper rifle. However, it is equipped with a prominent barrel shroud to which its bipod is also fixed. Given its description as "signature-suppressed", the rifle likely features some form of integrated suppressor.
The signature-suppressed anti-materiel rifle is the starting weapon of the UNSC Sniper unit in Halo Wars 2. It can be upgraded to the more powerful M99 Stanchion, though the in-game model of the weapon itself does not change with the upgrade.
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